Another question about normal maps
Yes.  You just need to ensure that you have an image texture assigned to the object and that the object has a UV map.

In it's simplest form, using Cycles:


Split your screen so you can see the 3D view and a UV/Image
Editor
Create a new image in the image editor.  Let's call it
"BakedNormalMap"
Switch back to your 3D view and select your hi-poly object
Make sure you've unwrapped it and it has a UV map.
Add a new material
Click the dot at the end of the Color option and choose Image
Texture (this can be achieved with the node editor if you prefer)
Select your BakedNormalMap as the image
Switch from the Materials tab to the Render tab and scroll to the
bottom to find the Bake options
Choose the Normal option and below this in the "Normal Settings" choose Space: Object
Bake


Don't forget to save your file.